Improvement in throttle-valves



. R. BIESTER.

THROTTLE-VALVE.

Patented Dec.14.-,1875.

WITNESSES INVE NTOR WW WW ER. WASHINGTON. D C,

W PETERS PNOT UNITED STATES PATENT OFFICE.

RUDOLPH BIESTER, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN THROTTLE-VALVES.

Specification forming part of Letters Patent No. 171,086, dated December 14, 1875; application filed October 8, 1873.

To all whom it may concern:

Be it known that I, RUDOLPH BIESTER, of Chicago, in the county of Cook and State of Illinois, have invented an Improved Throttle Valve for Locomotive-Engines, of which the following is a specification:

The nature of this invention relates to an improvement in throttle-valves for locomotive engines, which, instead of being a slide located at the inner end of the steam-pipe in the steamdome, is a double puppet lmlance-valve, located at the branch or T-head of the steam-pipe outside the front flue-sheet, the object being, first, to so construct the valve that it may he nearly or quite balanced, it so desired; and, secondly, to render the valve, seats, and connections accessible without the necessity of goining into the shell of the boiler.

Figure l is a longitudinal vertical section through the steam-pipe, T-head, and valveseats, showing the throttle in side elevation, the front end of the boiler being also included in the section to show the application of the valve. Fig. 2 is a front elevation. Fig. 3 is an enlarged plan of the T-hea-d.

In the drawing, A represents the front fluesheet of a locomotiveboiler, and B the steampipe, to the front end of which is secured the T-head C, from the sides of which the'branch steam-pipes B extend to the steam-chests. The Thead is chambered, (as seen in Fig. 1,) with two valve-seats, one at each opening in the top and bottom diaphragms of the shell, which openings are closed by two puppet valves, (1 I), mounted on a spindle, D, playing through a stuffing-box, c, in the cap of the T-head, the said stuffing-box also extending through the top of the smoke-box, on top of which two brackets, E, are bolted, between which an arm, F, is keyed on a shaft, Gr, journaled in said brackets. The top of the valvestem is connected with the end of the arm F by a link, H.

On the out-board end of the shaft G is keyed a pendent arm, I, from which a rod extends back into the cab within reach of the enginedriver.

In the present valve the upper one, a, has a little more area than the lower one, b, so that the upward pressure of the steam, under the latter, will not quite equal its downward pressure upon the former, so that the valve will always have a tendency to seat itself, if left uncontrolled.

It is evident that the T-head can be so chambered that the steam-pressure will be exerted upon the valves between the seats, instead of at top and bottom, as shown.

I do not claim the invention of the balanced puppet-valves, as such have long been in use on stationary and marine engines.

What I claim as my invention is The combination of the puppet-valve a b D, arranged within the T-head U,witl1 the brackets E. arms F and I, shaft G, and link H,

constructed and arranged substantially as described, -for the purpose set forth.

. RUDOLPH BIESTER. Witnesses:

WM. H. LoTz, HENRY BLANK. 

